Thomas edward caddy



larly broken.

'UNITED STATES.

PATENT rricn.

THOMAS EDIVARD CADDY, OF NOTTINGHAM, ENGLAND.

FIRE-BAR.

SPECIFICATION forming part of Letters Iatent No. 425,405, dated April 15, 1890.

Application filed December 17,1839. Serial No. 334,047. (No model.) Patented in England July 18, 1884, N0.10,289.

To all whom it may concern:

Be it known that I, THOMAS EDl/VARD CADDY, a subject of the Queen of England, residing at Nottingham, in England, have invented certain new and usefullmprovements in Fire-Bars, (for which I have obtained Letters Patent of Great Britain, No. 10,289, dated July 18, 1.884,) of which the following is a specification.

This invention has for its object to construct a fire-bar with a tubular passage running longitudinally from end to end through it for the heating of air supplied to a furnace for consuming the smoke therein and with chilled and consequently hardened faces, and thus to render it very strong and durable.

In the accompanying drawings, Figure 1 is a side elevation of a fire-bar constructed ac cording to this invention, the length being broken for, convenience of representation. Fig. 2 is a plan of two of the bars, shown simi- Fig. 3 is a transverse section of the same taken on, the line a b of Figs. 1 and 2; and Fig. 4 is a plan of the end of a bearer-bar, partly in section.

Like letters indicate like parts throughout the drawings. A are preferably wrought-iron tubes, which are cast in the bar. at their front ends, if. preferred, so as to pass through holes or slots in and project beyond the under side of the front bearing-bar. The tubes may be of any suitable shape in section, and, if desired, each bar may be provided with more than one tube.

B is the body portion or fire-bar proper, provided with the usual projections or distance pieces B. For providing for the employment of two or more fire-bars, arranged longitudinally end to end, I construct some of them with recesses or sockets at one end and the tube extremities projecting at the other end, so that when two or more such bars are fitted end to end the projecting portion of the tube A of one bar will enter the recess or socket of the next bar and so on, thus practically forming a continuous air-passage in each longitudinal set of fire-bars.

In some cases the tubes in each longitudinal set of bars may be connected by a loose coupling or union 0, shown in longitudinal section and approximating in cross-section to They may be bent downthe shape of the bars. With this arrangement the tube A projects at both ends of the bar, and can thus be more conveniently coupled and is more easily supported in the mold while casting.

In constructing one of the before-described fire-bars the wrought-iron tube A is laid in the mold and the metal poured in around it, and by contact with the tube A the molten metal will become chilled and a hardened firebar will result. For further hardening the said fire-bar it is cast face downward in the mold, the bottom of which is formed by a metal plate or the like, and by contact with this metal surface the upper face of the firebar becomes case-hardened, and thus adds to the general strength and durability of the said bar.

To prevent the end plates D of the bearerbar E, which are adjustable, (so as to regulate its length) from slipping, I form on the inside of the plates D a set of teeth or projections D, and a corresponding set of teeth or projections E on the outside of the bearerbar. \Vhen the bolt F is screwed up, the teeth D on the plate D engage with the teeth E on the bearer-bar E, thus effectually pre- Venting the plates D moving until the bolt F is released.

In the employment of fire-bars constructed according to this invention the air which is to be admitted to the fire first passes through the tubes A, wherein it becomes highlyheated, so that when it passes from the rear end of the bars at the back bearing-bar it will cause combustion of the carbon and burn the smoke,

and thus to a considerable extent economize the amount of fuel consumed. By passing it through the tubes A the air will also have the effect of keeping the bars cool, and by supplyin g the air to the fire in this manner it will prevent the unequal expansion and contraction of the boiler-plates, such as is caused when cold air is allowed to pass over the fire.

- I claim- 1. A fire-bar having a tube or tubes cast therein and the ends thereof projecting beyond said bar, substantially as shown, and for the purposes described.

2. The herein-described fire-bar having one or more tubes cast therein and one end of each tube projecting beyond the end of the fire-bar and the opposite end recessed and In testimony whereof I have hereto set my adapted to receive a similar projecting tube, hand in the presence of the two subscribing to substantially as described. Witnesses.

3. The combination, with a bearer-bar, of t 5 teeth or projections formed on the sides and rlHOMAS EDWARD D adapted to engage with teeth or projections Witnesses: formed on adjustable plates, substantially as H. C. SHELDON, described. WILLIE WAIN. v 

